I remember looking up some solutions on xsimulator.net back in 2014 when I had the dk2, the consensus was mounting the camera on the frame itself to avoid rotation relative to the room, but as Evol points out I had completely forgotten the Lighthouses use rotors that could be compromised with the platform rotation :-/
Inside out without external markers (ALA Microsoft new HMDs for example) would be difficult to I'm afraid in that model, you'd have to black out all the panels otherwise the depth cameras would pick the external walls as a point of ref.
That's funny it was simpler when back in 1995 I wanted to buy a Sega 360 to use with a Forte VFX-1 for playing DID's Ef2000, no positional tracking but cool for the time!
But then again, now that I think about it, due to safety it would be even wiser to strap in the seat with a neck brace to avoid injuries, so the postrack would be really limited anyways...
Ok then, if I get the funding the next issue is to find a room with a high enough ceiling, I don't think my current home/office would be capable of containing it.